android.app.ActivityThread is missing in current sdk

开发者_JAVA技巧I found some examples in the web which use android.app.ActivityThread but I can't find it in my android sdk installation (2.1 and 2.2), and neither on the android sdk webpage.

Was the ActivityThread removed from the current sdk? If so, is there an alternative?

Thanks Thomas

ActivityThread is a class in the Android firmware, but it has not been part of the Android SDK since 1.0, AFAICT. Whatever examples you are either much too old or are designed for people modifying the firmware.